fix: ensure starting listeners before plugins

src/emqx_app.erl

@@ -42,10 +42,13 @@ start(_Type, _Args) ->
     ekka:start(),
     {ok, Sup} = emqx_sup:start_link(),
     ok = start_autocluster(),
+    %% We need to make sure that emqx's listeners start before plugins
+    %% and modules. Since if the emqx-conf module/plugin is enabled, it will
+    %% try to start or update the listeners with the latest configuration
+    emqx_boot:is_enabled(listeners) andalso (ok = emqx_listeners:start()),
     ok = emqx_plugins:init(),
     _ = emqx_plugins:load(),
     _ = start_ce_modules(),
-    emqx_boot:is_enabled(listeners) andalso (ok = emqx_listeners:start()),
     register(emqx, self()),
     ok = emqx_alarm_handler:load(),
     print_vsn(),